[4-(5'-Trifluoromethylpyridyl-2'-oxy)-phenoxy]-propionic acid esters with .alpha.-hydroxy or .alpha.-mercapto gamma-butyrolactone and their use as herbicides
AssigneeCiba-Geigy Corporation
InventorsBeat Bohner, Hermann Rempfler
Life of this patent
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Abstract
Novel .alpha.-[4-(5'-trifluoromethylpyridyl-2'-oxy)-phenoxy]-propionic acid -.gamma.-butyrolactone esters and -thioesters of the formula ##STR1## wherein R is hydrogen or chlorine, and X is oxygen or sulfur, which compounds have herbicidal activity. They are especially suitable for selectively combating gramineous weeds in cultivated crops. These compounds are produced by esterifing pyridyloxy-phenoxy-propionic acid with .alpha.-bromo-.gamma.-butyrolactone.
Claims8
.alpha.-[4-(5'-Trifluoromethylpyridyl-2'-oxy)-phenoxy]-propionic acid-.gamma.-butyrolactone ester and -thioester of the formula I ##STR6## wherein R is hydrogen or chlorine, and X is oxygen or sulfur.
Dependencies are inferred from the claim text.